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Calculate T, log10 fO2 at specified Pressure

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Specify pressure and olivine, spinel and orthopyroxene compositions:

Leave input temperature set to zero to calculate a temperature from olvine-spinel equilibrium and a log10 fO2 from olvine-spinel-orthopyroxene equilibrium. Alternately, input a temperature to calculate a log10 fO2 from olvine-spinel-orthopyroxene metastable exchange equilibrium at the specified temperature and pressure.

Olivine Spinel Orthopyx
Oxide Wt% Wt% Wt% Intensive Variables
SiO2
T (C)
TiO2
P (GPa)
Al2O3
Fe2O3
Cr2O3
FeO
MnO
MgO
NiO
CoO
CaO
Na2O
T, log fO2
Use the specified Fe2O3 content of the Orthopyroxene.

Calculations are based upon thermodynamic models developed in the following papers:

  • Sack RO, Ghiorso MS (1989) Importance of considerations of mixing properties in estab­lishing an internally consistent database: Thermochemistry of minerals in the system Mg2SiO4-Fe2SiO4-SiO2. Contrib Mineral Petrol 102, 41-68
  • Sack RO, Ghiorso MS (1994) Thermodynamics of multicomponent pyroxenes: I. Formulation of a general model. Contrib Mineral Petrol  116, 277-286
  • Sack RO, Ghiorso MS (1994) Thermodynamics of multicomponent pyroxenes: II. Phase relations in the quadrilateral. Contrib Mineral Petrol  116, 287-300
  • Sack RO, Ghiorso MS (1994) Thermodynamics of multicomponent pyroxenes: III. Calibration of Fe2+(Mg)-1, TiAl(MgSi)-1, TiFe3+(MgSi)-1, AlFe3+(MgSi)-1, NaAl(CaMg)-1, Al2(MgSi)-1 and Ca(Mg)-1 exchange reactions between pyroxenes and silicate melts. Contrib Mineral Petrol 118, 271-296
  • Sack, RO, Ghiorso, MS (1991) An internally consistent model for the thermodynamic properties of Fe-Mg-titanomagnetite-aluminate spinels. Contrib Mineral Petrol 106, 474-505
  • Sack, RO, Ghiorso, MS (1991) Chromian spinels as petrogenetic indicators: thermody­namics and petrological applications. Am Mineral 76, 827-847

 

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